I spent most of last month in Milwaukee. One place I visited was Johnson Controls. You've probably seen their products - they've been making commercial thermostats for around 100 years. They have a little museum in their lobby that shows some of their products over the years. On one wall of the lobby they had this display of postcard images mixed in with images of their products. I'm not quite sure what they were going for here since there wasn't a description, but I'm guessing the old postcards represented buildings that had installed Johnson Controls products. They had quite a few cards from the early 1900's and some Chromes. Kind of a neat way to display them though - as you can see it has a 3-D look, with each of the cards suspended off the glass behind it.